MySQL主從復制的配置及原理

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mysql 5.5   環境用的數據庫可的多實例

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mysql 主從復制原理圖

mysql 主從復制開始配置  環境是一個數據庫多個實例 3306端口為主 3307端口為從

1 開始配置主庫和從庫的my.cnf配置文件

配置主數據庫的my.cnf文件（3306）

server-id       = 1

log-bin=mysql-bin
配置從數據庫的my.cnf文件（3307）

server-id       = 2

#log-bin=mysql-bin

然后重啟數據庫

2登錄主數據庫給從數據庫分配權限用戶

grant replication slave on *.* to 'repl'@'192.168.1.17' identified by '123456';

3 鎖表并且導出主庫里的數據

 flush table with read lock;

show master status;查看bin-log的位置狀態

+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000009 |      264 |              |                  |
+------------------+----------+--------------+------------------+

/usr/local/mysql/bin/mysqldump  -uroot -plampol -S /tmp/mysql3306.sock --events  -A  -B > /tmp/master.sql;

4 進從數據庫導入主數據庫的數據

source /tmp/master.sql

5進從庫執行

change master to master_host='192.168.1.17',
      master_port=3306,
      master_user='repl',
      master_password='123456',
      master_log_file='mysql-bin.000009',
      master_log_pos=264;

6 從庫開啟同步開關 start slave

• show slave status \G;
  *************************** 1. row ***************************
                 Slave_IO_State: Waiting for master to send event
                    Master_Host: 192.168.1.17
                    Master_User: repl
                    Master_Port: 3306
                  Connect_Retry: 60
                Master_Log_File: mysql-bin.000009
            Read_Master_Log_Pos: 500
                 Relay_Log_File: bogon-relay-bin.000002
                  Relay_Log_Pos: 489
          Relay_Master_Log_File: mysql-bin.000009
               Slave_IO_Running: Yes
              Slave_SQL_Running: Yes  //兩個yes就ok了主從配置成功
                Replicate_Do_DB:
            Replicate_Ignore_DB:
             Replicate_Do_Table:
         Replicate_Ignore_Table:
        Replicate_Wild_Do_Table:
    Replicate_Wild_Ignore_Table:
                     Last_Errno: 0
                     Last_Error:
                   Skip_Counter: 0
            Exec_Master_Log_Pos: 500
                Relay_Log_Space: 645
                Until_Condition: None
                 Until_Log_File:
                  Until_Log_Pos: 0
             Master_SSL_Allowed: No
             Master_SSL_CA_File:
             Master_SSL_CA_Path:
                Master_SSL_Cert:
              Master_SSL_Cipher:
                 Master_SSL_Key:
          Seconds_Behind_Master: 0
  Master_SSL_Verify_Server_Cert: No
                  Last_IO_Errno: 0
                  Last_IO_Error:
                 Last_SQL_Errno: 0
                 Last_SQL_Error:
    Replicate_Ignore_Server_Ids:
               Master_Server_Id: 1